In theory map fun will attach to the first process it sees. It checks via process name eg TwelveSky2 rather than window name.
I will work on adding support for multiple process attaching infact I may even program into map fun the functionality to open many processes of 12sky2.
Rather than executing the game twice and fast I will enable running the game and bypassing the code that checks for another instance of the game already running
Map fun will attach to this one so you could run two copys of map fun and launch the game twice using both of those having map fun on two instances of 12sky2.
However thats work in progress and only If i have enough people wanting it and I have the time of course